and Vero cells (ATCC, CCL-81)) from African green monkeys were cultured in
Dulbecco’s modified Eagle’s medium (HEK293T, VeroE6) or Minimum Essential Medium
(MEM.; Vero). HEK293T expressing ACE2 (293TACE2) was obtained from
GeneCopoeia Inc, Rockville, MD. All cell lines were supplemented with 10% fetal
bovine serum (F.B.S.), 1X L-Glutamine and 1% penicillin and streptomycin. The
rabbit polyclonal antibody against SARS-CoV-2 SP (Cat# 40150-R007) and ACE2
protein (Cat# 40592-T62) were obtained from Sino Biological and anti-HIVp24
monoclonal antibody was described previously [34 (link), 35 (link)]. The HIV-1 p24 ELISA Kit was obtained
from the AIDS Vaccine Program of the Frederick Cancer Research and Development
Center. SARS-CoV-2 SP-ACE2 binding ELISA kit (Cat# COV-SACE2-1) was purchased
from RayBio. Anti-SARS-CoV-2 neutralizing Antibody (nAb) Human IgG1(SAD-535) was
purchased from ACRO Biosystems. AH0109 was described previously [36 (link)].